Ringing device for telephone-exchanges.



No. 872,293. PATENTED NOV. 2,.1907. w. W.DEAN.

RINGING DEVICE FOR TELEPHONE EXCHANGES.

APPLIOA'IION FILED AUG. 8,1906.

3 moan l'oz manual initiation;

30 use,

I T TES arnsronnion.

WILLIAM w. DEAN, on ELYRiA, onro, ASSIGNOR TO THE DEA-N ELECTRIC COMPANY, on I ELYRIA, OHIO, A OORPORATION OF OHIO.

'. nmeme nnvrcn roa'rnmrnonn-nxcnmens,

Specification of Letters l aten t.

Patented. Nov. 26, 1907.

Original application its January is. 1906.Beria1 it. 296.286. Divided mi this application filed August 8.1906.

To all whom it may concern:

Beit known that I, WILLIAM DEAN, a citizen ofthe United States, residing at Elyria, in the county .of. Lorain and. State of sJQhio ha've. invented certain new and useful Improvements'in Ringing Devices for Tele In thecommercial practice of telephony '15 there are a number of conditions to be met in regard to ringin wanted subscribers,-'which have not hereto ore been satisfied. Among these I may mention 'the necessity for making the operator's work as simple as possible,

substitut ng mechanism in her'place' wherever practicable, so that said mechanism wilhperform required operations upon heralso the economic condition resulting from raising the standards of exchange construction, and (particularly that ofthe networkfof wires an cables in a system, soflthatlthe increase in the investment demands a maximum use of the plant at a fixed return, or the maximum return at afixed in order to be profitable, this condition having brought about the general adoption and use of party-lines in cities. Party-line is in many respects a problem by itself,

' butm my present development of'the sub-' 3'5 je'ct I apply the same principles in its treatby in ordinary singleparty,,.or other ringing, combining therewith the special feature of selection on the part of i the operator. v j.

The principal object of my invention is to meet the requirements I have stated, as well as others included in the same category, and in so doingto produce apparatus and circuits for automatic ringing which will be applicable to existing systems as well as new installations, and which for that purpose can be made, complete and self contained in themselves. As a corollary object is theelimination of inductive resistance-or other impending factor in theringing circuit, and the general improvement of the same in detail.

ment which I emp Inattaining' myobjects I employ as the basis for my scheme of circuits and appara- Serial No. 329.761-

.tus, a

vice maintaining the relay circuit in until the j subscriber has answered,'whereupon the re: lay is instantly disconnected and the talking This device is non-inductive, f i consistirig preferably of a hot wire or thermic t takes current either from genor from the main-batterm-and ringing re ay is for single-partfiymlines or for naling .It is t energized operator, and when ener important functions of t poly-station sigy the act of the rin ing relay. The' operation of. this f I the same whether it be used ized it performs the I i 9 gms key, opening the 001d-0110111i3, 8.!1d.60111180trmg the generatorcircuit across the terminals of the calling lug.- In connection with .this relay I provi e a device responsive to current changes in the subscriber's line, this deoperatiyecondition, and the relay active,

circuit thereby restored, clear of ,all'generator connections.

relay. er'ator circuit the connections are such that-it will-respond as soon as 'the subscriber whether the enerator is that .momentconnected, or:

What or it'is d' rings, the t battery that 1 preferably employ a commutator in thegenerator circuit, which puts current onythe keys at brief recurring intervals of saytwo seconds duration, with intervening intervals of four seconds -.duringwhich the circuit is grounded, current then coming back over the subscribers line from the main battery.

In party line ringing, line work, the operator siniply depr'esses the proper key, which closes t e circuit of the rin ing relay, which in turn closes its own loc g circuit through the normally closed contact of-the thermic relay whose operating wire is at the sametime included between the generator circuit and line. Generator current then goes to line at successive intervals, as already stated, until the subscriber an:

as in single-station interval between mg then connected.

---Th1s-willbe' understood when I point out .80

swers, when the thermic relay breaks thelocking circuit, the ringing relay lets go, all

generator connections are cut-off, and the talking circuit is restored.

This application is a division of. my ending application, Serial No. 296,288, filed anuary 16th, 1906.

My invention 15 illustrated in the accom-j panying drawings, in which the figure shows a diagrammatic view of the circuits used.

Referring now to the drawing, I have.

shown therein two subscribers stations A, A

' each connected to the central oflice by linewires 1' and 2,. terminating in the contacts of a cut-off relay, and connected when its relay is energized to the respective jacks, J, J.

Each line has a lamp signal, L, governedbv the relay in the usual way, and both lines -are supplied with current for all purposes from the common main battery B. To interconnect these lines I show a cord-circuit 3, 4, 5,

6, 7, 8,'separated by condensers, C, C, and

.between them. The conductors'34 terminate in the answeringfpluglP, while the conductors 5,7 and 6- 8 terminate in the ca ing plug 1?. The keyK and the ringing relay, K, are associated with this plug, P. Also associated with the plug is a thermic relay or circuit controller, B. This cornprises a strain plate, 1', a pivoted lever, r, and a pair of wires, 1' ricon'nectingthe corners of the strain plate with points on the lever lying upon opposite sides of the pivot thereof.

he wire, T is electrically disconnected from everything else, but the wire, r forms a part of the common generator circuit, 9 1(), passing to the key, K. The relay K is included in a circuit, 11, 12, 13, 14, 15 passingthrough the springs, 7c, 7r. Tbis circuit is closed from the main battery to ground, when the plunger is pressed all the way down so as'to close together the springs, 7c", is. As soon asthe relay attracts its armatures, owing to this closure, it looks itself through the supplemental circuit, 16, 17, 1.8, which passes through normally closed contacts of the thermic relay R. 1

I have shown but one source of current, marked G, and connected from ground. to the wire 10 through the constantly driven commutator G, which has a segment insulated for the generator and the rest of its periphery grounded. The proportions of the grounded and generator segments may be varied at will, but they are preferably such and the speed of revolution is so adjusted,'that.the source of current, G, will be connected to the wire 22 for two seconds, and the wire will be grounded for four seconds, in each revolution.

The operation of the system thus described is as follows:Assuming subscriber A to have called, and the call to have been answered in the usual Way, also that the calling plug, P, has been inserted in the jack, J, of the wanted line, if the wanted line is a singleparty line, the operator closes the springs, 7r, k, by de ressing a plunger, whereupon the relay K ecomes energized by current from the main battery B, and draws in its armatures, thereby openin the cord-conductors 5 -7 and 6-8, anc connecting the swers, substantially as described.

portions '7 and 8 to the wires 9, 11 respec I tively. The wire 9 thus leads from the. tip of the plug through the wire r to wire 10, to generator, and ground on the other side the wire 8 goes to main battery through the resistance Hi. The locking circuit for the re-.

17, 16, ground. As long as the thermic relay remains in normal condition the relay K" line 1-2 in place of his ringer, Q, thus substituting a low resistance for a relatively high one and thereby pernnttmg a very large 1ncrease in thegenerator current flowing 1n the line.

rent required to actuate a subscriber's ringer as limited by the resistance thereof, will not heat the wire 1* sufficient-lyjto open the conlay K is as follows: B, 11,12, K, 13, 18, r, v

The thermic'relay B is so proportioned and adjusted that the amount ofcur-f v tact made by the lever r v(hen the subscriber has bridged his t-elephone, however the consequent increase in current heats the wire 1 to a greater degree, so that by its expansion theleverris moved and opens the normally closed contacts and breaks the locking circuit 16, 17 18. As soon as this is broken the rel y, K, releases its armatures, and cuts ofl'ithe generator, at the same time restoring the continuity ofthe cord-conductors.

I am aware that man'y" changesinay be made in the apparatus and some changes in .the circuits, which I have'herein set forth;

without altering the characteristic essential features of my invention, and all such changes are contemplated by me and are to be ta ren as within; the scope ofmy claims.

Having thus described my invention, what 1. An automatic ringlng device fortele phone systems, comprising air nglng relay having hue and generator; connectionsyan the relay circuit, short-circuit contacts conscribed. 2. In a telephone ing relay, an operators key'adapted to te1nporarily close the circuit ofsaidrelayfalock ing circuit closed through itself by the a-clay when energized, and non-inductivemeans then becoming associated with the wanted subscribers line-circuit, adapted to, break .105 I claim and desire to secure byLetters Patent is operators key adapted .tomomentarilyclose system,; a cord-circuit automatic ringing device comprising a rmg-' said locking circuit when the subscriber an- 3. In a telephone system a cord-circuit automatic ringing device comprising a ring- I connected thereby to line, a locking circuit I 7 closed by the relay through itself when ener- 'gized, and non-inductive means included 1n the generator circuitadapted tobreaksaid 1 5 locking circuit when the called subscriber an 'swers, substantially as described.

4. In a telephone system, a cord circuit automatic-ringing device, comprising'a ringr ing relay, a generator circuit adapted to'b e' 0 g i for said relay closed by itself when energized,

' non-inductive means responsive to an act of connected to line thereby, a locking circuit the called subscriber for breaking said locking circuit, and a manual key under the conswering a'call, a ringing relay in the cor d trol of an operator for initially closing. the circuit of the ringing relay.

5. .In a telephone exchange system, a cord? circuit, a subscribers line adaptedtobeconnetted thereby, a ringer of relatively high re adapted to become bridged on the line in anc'rcuit adapted to connect a generator to. line "t J actuate the ringer, and a non-inductive ievice 1n the path of the generator current to line and controlling the ringing relay, said non-inductive device being unresponsive to current of an amount determined by the re s stance-of the ringer, but responding and b ecom ing active for an amount of current permitten to pass by the low resistance tele' phone set, substantially as described.

' 6. [n a telephone system, a subscriber's line, an operators cord circuit and calling plug adapted to connect with said line, a ringing relay associated with said calling pug and adapted to connect a generator tl. crew and to line, an operators'ringing key 40 ada]|t'ed to initially complete'the circuit of he ringing relay, means then becoming 0pe1 itivc to com lete a locking circuit through the 'ringing re ay, and a non-inductive current-responsive device in circuit with the gen arator and controlled by an act on the .pajstof'the subscriber for breaking the lockin g c 'rcui t ofv the ringing relay.

' 7. In a telephone exchange system, a line (ll'c ljllt and an operators cord plug circuiti'd apt ed to c onnectt herewith, a ringer bridged across the line, means associated with said rin er to place a low resistance shunt across ,the in'c in answer to a call a ringing relay asso-' ciated with the cord circuit calling plug to conheat a generator to the line, means then Be- 7 zone mg operative to close a locking circuit ihrcugh the ringing relay, an operators'ring- 1i g hey f 3r initiall closing the circuit of the rnging rala ,an .a non-inductive current- .r-asp onsiv e evice then brought into the gem:

I erat )r circuit to line, and thereafter respondi'ng 1 0 a rise of current in the line to break the lock ng ciicuit of the ringing relay.

1,8! In a telcphoneetzrchange system a line than it and an operatcrs cord clr ouit, haying .sisgance normally bridged across .said line, a. "telephone set. of relatively low resistancei of an'operator for initially a calling plug adapted to connect with the line, a rin r bridged across the line, means associated with the ringer to place a low resistance shunt across theline in response to an act of the subscriber, a ringing relay associated with the cord circuitcalling plug and adapted to connect a generator to the line and to close a locking circuit through .itself, an operators key for initially closing the circuit of the ringing relay', and a ther mally operable device then brought into the generator circuit and thereafter responding to an act on the part of the subscriber to break the locking circuit of theringing relay.

9. In a telephone exchange system, an operators cord circuit and callin plug, a ringin 'relay associated with the ca ling plugand adapted to connect a ringing generator to line, anoperators' ringing key adapted to be momentarily closed to energize the ringing. relay and thereby to connect the genferator toljline, anda non-inductivecircuit responslve' device thereafter included in the ringing generator circuit and controlling said relay. 4

10. Anautomatic ringing devicefor telephone systems, comprismg a ringing relay then\ becoming assoc-iated with the wanted subscriber's line circuit, adapted to break said locking circuit when the subscriber answers, substantially as described,

12. In a telephone system a cord-circuit automatic ringing device comprising a ringing relay, a-generator circuit adapted to be connected thereby to line, a locking circuitclosed by the relay through itself when energized,*and thermic means included in the generator circuit adapted to break said lockmg circuit when the called. subscriber answers, substantially as described.- 13. In a telephone system, a cord circuit automatic ringing device, comprising a ringing relay, a generator circuit ada ted to be connected to line thereby, a locking circuit,

for said relay closed by itself when energized, thermicme'ans responsive to an actofthe called subscriber for breakin' said lockin circuit, and a manual key u n er the contrdl closing the circuit ofthe ri in relay. 14. In. a tee1 p one exchange system; a

cord-circuit a subserihers line ada ted to be connected thereby, a ringer of relatively 1 high resistance normally bridged across said line, a telephone-set of relatively low resistance adapted to become bridged on the line in answering a call 'a ringing'relay in the cord-circuit adapted to connect a generator to line to actuate theringer, and a therrnic device in the path of the generator current to line and controlling the ringingrelay, said thermic; device being unresponsive to cur-' relay controlled by the subscriber and controlling the ringing relay, substantially as 'described. I

16. Ina telephone system, a subscribers line, an operator's cord circuit and calling plug adapted to connect with said line, a,- ringing relay associated. with said calling plug and adapted to connect agenerator Wire thereto and totthe line, angoperators ringing key adapted to initiallylcomplete' the circuit of the ringing relay, andrneans to lock the circuit of the ringing relay, together with thermic means contro scriber to release the ringing relay,-"substan tially as describedr 7; -17. In a telephone system, a subscribers line, anoperators cord circuitand'calling "plug adapted to connect with said line, a

ringing relay associated .With said calling plug and adapted to connect a generator through said relay by itself, .to ether with thermic means thereafter contro ed'by the ringing relay, substantially as'describedQ In testimony whereof I aflix in presence of two Witnesses.

WIL IAM-W; DEAN. Witnssesz' RAY H. MANSON,

1 N. SMALLWOOD;

my signature 40 Wire thereto and to the liney-a-ri'ngingkey adapted to initially complete the circuit of the ringing relay, and a locking circuitclosed subscriber to open the locking circuit of said 

